Question

the earth's crust is unstable Explain its two effects on the eath 's surface

Answer 1

The earth's crust is unstable because of the exogenic forces.The exogenic forces are modified by two processes - weathering and erosion.
Weathering is the process of disintegration of rocks.
Erosion is the process by which weathered material are transported elsewhere.

Answer 2

Due to increase of temperature in layers of earth the earth surface gets heated and cause damage of layers of earth and this leads to disastets and tsunami. So,these are two effects of earth's crust.